Fix an issue when inserting emoji into address bar.

Composition is started and ended in same edit session during emoji
insertion. Selection should also be set during |SetCompositionText|
in the above scenario so that |TextInputClient| such as |TextField|
can have updated cached selection.

Bug: 1111523
Change-Id: Ie2b1dc1365a1a778ea9cc5367f82bd2086cc0b94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2331291Reviewed-by: Yohei Yukawa <yukawa@chromium.org>
Reviewed-by: Siye Liu <siliu@microsoft.com>
Commit-Queue: Siye Liu <siliu@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#795055}

ui/base/ime/win/tsf_text_store.cc

@@ -1392,6 +1392,8 @@ void TSFTextStore::CommitTextAndEndCompositionIfAny(size_t old_size,
       CompositionText composition_text;
       composition_text.text = new_committed_string;
       composition_text.ime_text_spans = spans;
+      composition_text.selection.set_start(new_committed_string.size());
+      composition_text.selection.set_end(new_committed_string.size());
       text_input_client_->SetCompositionText(composition_text);
     }
     text_input_client_->InsertText(new_committed_string);

ui/base/ime/win/tsf_text_store_unittest.cc

@@ -2561,6 +2561,7 @@ class RegressionTestCallback : public TSFTextStoreTestCallback {
   void SetCompositionText4(const ui::CompositionText& composition) {
     EXPECT_EQ(L"c", composition.text);
     ASSERT_EQ(1u, composition.ime_text_spans.size());
+    ASSERT_EQ(gfx::Range(1, 1), composition.selection);
   }
 
   void InsertText4(const base::string16& text) { EXPECT_EQ(L"c", text); }